Sea levels have gone up and down significantly throughout Earth’s history. 120,000 years ago (during the time between the last 2 ice ages) the average sea level across the globe was over 5 metres higher than it is now !
For the past few thousand years, sea levels have been stable , but since 1901 the average global sea level has risen by 19 centimetres .
You can see a range of possible forecasts for sea level rise in the graph we posted .
The average rate of increase in sea levels since 1901 is 1.7 millimetres per year , but if we take the average over 2007 to 2016 this shoots up to roughly 4 millimetres per year .
This increase in the rate of sea level rise is due to more ice melting from ice sheets in Greenland and Antarctica .
By 2100, if there is no change in climate policy, sea levels are expected to rise by 15 millimetres per year, and several centimetres a year by 2200 !
 https://www.ipcc.ch/site/assets/uploads/2018/02/WG1AR5_TS_FINAL.pdf Technical Summary, IPCC AR5, Working Group 1, 2018 (TS.2.6)
 https://www.ipcc.ch/site/assets/uploads/2018/02/WG1AR5_TS_FINAL.pdf Technical Summary, IPCC AR5, Working Group 1, 2018 (TFE.2 Paragraph 1)
 https://www.ipcc.ch/site/assets/uploads/2018/02/WG1AR5_TS_FINAL.pdf (TFE.2 Figure 2)
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